Table 2. Laboratory measurements of patients with different IgM titers.
| IgM < 50 AU/ml (n=39) | IgM ≥ 50 AU/ml (n=40) | P | |
| Arterial blood gas analysis | |||
| PH | 7.38±0.06 | 7.40±0.05 | 0.136 |
| PaCO2, mmHg | 44±7 | 42±8 | 0.277 |
| PaO2, mmHg | 59±6 | 56±7 | 0.044 |
| SaO2, % | 91±4 | 89±4 | 0.039 |
| White blood cell count, ×109/L | 6.9±3.0 | 7.1±2.8 | 0.777 |
| Neutrophil count, ×109/L | 5.5±2.9 | 5.8±2.9 | 0.608 |
| Lymphocyte count, ×109/L | 0.9±0.4 | 0.9±1.0 | 0.800 |
| Haemoglobin, g/L | 126±15 | 126±19 | 0.812 |
| Platelet count, ×109/L | 249±118 | 228±87 | 0.369 |
| ALT, U/L | 24(18-44) | 39(16-63) | 0.161 |
| Albumin, g/L | 34±4 | 32±5 | 0.010 |
| Creatinine, μmol/L | 86±26 | 83±38 | 0.730 |
| Prothrombin time, s | 12.0±0.8 | 12.4±1.2 | 0.085 |
| Fibrinogen, g/L | 5.0±1.9 | 5.2±1.7 | 0.623 |
| D-dimer, mg/L | 0.95(0.44-2.59) | 1.81(0.77-9.06) | 0.020 |
| Cardiac troponin T, pg/ml | 10(6-18) | 12(8-20) | 0.666 |
| NT-proBNP, pg/ml | 80(59-252) | 264(73-590) | 0.031 |
| C-reactive protein, mg/L | 40(12-107) | 69(27-126) | 0.119 |
| IL-6, pg/mL | 17(6-70) | 42(12-119) | 0.141 |
| TNF-α, pg/mL | 11(8-17) | 9(5-12) | 0.111 |
Data are mean ± SD or median (IQR). IgM = Immunoglobulin M. PH = Pondus Hydrogenii. PaCO2 = partial pressure of carbon dioxide. PaO2 = partial pressure of oxygen. SaO2 = arterial oxygen saturation. ALT = alanine aminotransferase. NT-proBNP = N-terminal pro-brain natriuretic peptide. IL-6=interleukin-6. TNF-α = tumor necrosis factor-α.